public class TupleExpression extends Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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TupleExpression() |
| Modifier and Type | Method and Description |
|---|---|
int |
computeCardinality()
Get the cardinality of the expression.
|
Expression |
copy()
Copy an expression.
|
Tuple |
evaluateItem(XPathContext context)
Evaluate an expression as a single item.
|
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
|
ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the Tuple expression
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int |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived
from the dependencies of its subexpressions.
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible.
|
LocalVariableReference[] |
getSlots() |
Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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void |
setCurrentTuple(XPathContext context,
Tuple tuple)
Set the local variables in the current stack frame to values corresponding to a supplied tuple
|
void |
setVariables(List<LocalVariableReference> refs) |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntegerBounds, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSubExpressionInfo, markTailFunctionCalls, optimize, process, promote, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, simplify, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorpublic void setVariables(List<LocalVariableReference> refs)
public LocalVariableReference[] getSlots()
public ItemType getItemType(TypeHierarchy th)
ExpressionThis method should always return a result, though it may be the best approximation that is available at the time.
getItemType in class Expressionth - the type hierarchy cachepublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class Expressionpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class Expressionoriginal - the original subexpressionreplacement - the replacement subexpressionpublic Expression copy()
copy in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structurepublic Tuple evaluateItem(XPathContext context) throws XPathException
ExpressionevaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic void setCurrentTuple(XPathContext context, Tuple tuple)
context - identifies the stack frame to be modifiedtuple - the tuple containing the current valuespublic int computeCardinality()
computeCardinality in class Expressionpublic int getIntrinsicDependencies()
ExpressiongetIntrinsicDependencies in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.